Răspuns :
a = 6b
a + b =63
-------------
6b + b = 63 7b = 63 b = 9 a = 54
a + b =63
-------------
6b + b = 63 7b = 63 b = 9 a = 54
a ; b = 6
a +b = 63
a = 6b
6b + b = 63
7b = 63
b = 63 : 7
b = 9
a = 6 x 9 = 54
54 + 9 = 63
54 : 9 = 6
a +b = 63
a = 6b
6b + b = 63
7b = 63
b = 63 : 7
b = 9
a = 6 x 9 = 54
54 + 9 = 63
54 : 9 = 6